Detailed Description

AESCMAC (CMAC & CBC-MAC) driver implementation for the Low Power F3 family.

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Hardware Accelerator

The Low Power F3 family of devices has dedicated hardware accelerators. CC23XX devices have one dedicated accelerator whereas CC27XX devices have two (Primary and Secondary). Combined they can perform AES encryption operations with 128-bit, 192-bit and 256-bit keys. Only one operation can be carried out on the accelerator at a time. Mutual exclusion is implemented at the driver level and coordinated between all drivers relying on the accelerator. It is transparent to the application and only noted to ensure sensible access timeouts are set.

Implementation Limitations

Only plaintext CryptoKeys are supported by this implementation.

The following limitations apply to the AESCCMLPF3 Driver for CC27xx device family only:

The CryptoKey input must have the correct encoding, CryptoKey.h.
The application can only use one handle per driver. Concurrent dynamic instances will be supported in the future.
CCM driver only supports polling return behaviour. Blocking and callback return behaviours will be supported in the future.

Runtime Parameter Validation

The driver implementation does not perform runtime checks for most input parameters. Only values that are likely to have a stochastic element to them are checked (such as whether a driver is already open). Higher input parameter validation coverage is achieved by turning on assertions when compiling the driver.

#include <stdbool.h>
#include <stdint.h>
#include <ti/drivers/AESCMAC.h>
#include <ti/drivers/cryptoutils/aes/AESCommonLPF3.h>
#include <ti/drivers/cryptoutils/sharedresources/CryptoResourceLPF3.h>
#include <ti/devices/DeviceFamily.h>
#include <DeviceFamily_constructPath(inc/hw_types.h)>
#include <DeviceFamily_constructPath(driverlib/aes.h)>

Include dependency graph for AESCMACLPF3.h:

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Data Structures
struct	AESCMACLPF3_Object
	AESCMACLPF3 Object. More...

Macros
#define	AESCMACLPF3_DEFAULT_AUTOCFG ((uint32_t)AES_AUTOCFG_AESSRC_TXTXBUF \| (uint32_t)AES_AUTOCFG_TRGAES_WRBUF3 \| (uint32_t)AES_AUTOCFG_BUSHALT_EN)

#define	AESCMACLPF3_DMA_CONFIG ((uint32_t)AES_DMA_ADRCHA_BUF0 \| (uint32_t)AES_DMA_TRGCHA_AESSTART)

#define	AESCBCMACLPF3_DMA_CONFIG AESCMACLPF3_DMA_CONFIG

Typedefs
typedef AESCommonLPF3_HWAttrs	AESCMACLPF3_HWAttrs
	AESCMACLPF3 Hardware Attributes. More...

Macro Definition Documentation

§ AESCMACLPF3_DEFAULT_AUTOCFG

#define AESCMACLPF3_DEFAULT_AUTOCFG ((uint32_t)AES_AUTOCFG_AESSRC_TXTXBUF | (uint32_t)AES_AUTOCFG_TRGAES_WRBUF3 | (uint32_t)AES_AUTOCFG_BUSHALT_EN)

§ AESCMACLPF3_DMA_CONFIG

#define AESCMACLPF3_DMA_CONFIG ((uint32_t)AES_DMA_ADRCHA_BUF0 | (uint32_t)AES_DMA_TRGCHA_AESSTART)

§ AESCBCMACLPF3_DMA_CONFIG

#define AESCBCMACLPF3_DMA_CONFIG AESCMACLPF3_DMA_CONFIG

Typedef Documentation

§ AESCMACLPF3_HWAttrs

typedef AESCommonLPF3_HWAttrs AESCMACLPF3_HWAttrs

AESCMACLPF3 Hardware Attributes.

AESCMACLPF3 hardware attributes should be included in the board file and pointed to by the AESCMAC_config struct.